Phonograph motor



Oct. 6, 1925. 1,556,359 c. scHwARrz PHONOGRAPH KOTOR iledkJuna 1e. 1924. l 2 sheets-sneer .1

c. SCHWARTZ v Paoucsnua loro!! im Schwanz.; @6* @5% Patented Oct. 6, 1925.

UNITED STATES CARL SCHWARTZ, SHEBOYGAN FALLS, WISCONSIN.

Appnbati'on mea June 1e,y 1924. serial No. 720,311.

To all whom it 'may concern.' j

Be it known that I, CARL SCHWARTZ, a citizen of the United States, and resident of Sheboygan Falls, in the county of Sheboygan and State of Wisconsin, have invented certain new and useful* Improvements in Phonograph Motors; anvd'I'do hereby declare that-the following is a full, clear, and exact description thereof.

This invention relates to phonograph mo- U 1s provided with downwardly extending protors. j

Objects oftliis invention are to provide a phonograph motor which is equipped -With governing mechanism, which may be adjust-` ed while the motor is running, and in which a micrometer adjustment of governing mechanisnfi may be most readily attained.

Further objects lare to provide an electricV phonograph motor in which a very simple type of micrometer adjustment for the governor is secured, in which any one of a multitu de of different speeds may be secured VWiitih the 'utmost'precisiom and in which the control for the governor may be located in an easily accessible position.

Furtherobjects are to provide a compact Y electric 'phonograph motor and governing mechanism which is of simple construction, and which may be cheaply produced,

An .embodiment of the inventionis shown in the accompanying drawings, inwhiclny portion ofthe housing 15 for certain parts Figure 1 is a vertical fragmentary'l 'sectional view through a phonograph equipped with the motor and governor mechanism, such view corresponding to the line 1-,1 yof i Figure 2.

Figure 2 is a ,bottom viewof the structure Figure 3 is a transverse sectionalview on the line `3--3 o-f Figure 1. y p

Figure 4 is a transverse Vsectional view on the line 4-4 of Figure l. l n

Figure 5 is a view taken at right angles to Figure 4 showing the governor mechar nism in its position :for greatest speed.

.Figure 6 is a view correspondingto Figure 5 showing vthe governor mechanism in a different position of adjustment.y

The phonograph motor comprises a unitcarried by a base plate 1 supported from an attaching plate 2 (see Fig. 1) Aand held resilientlyxfrom said plate `by means of springs 3 and 4 positioned on opposite sides Aof the bed plate 1, and carried by bolts `5 hung-from and secured to the attaching plate 2.y This lattaching plate is secured to the lower side of the phonograph cabinet top 6 and the bolts 5 are preferably provided with tapered f heads set in recessed apertures formed in the attaching plate 2 so as to be securelylockedin place when the attaching plate 1s secured to the top 6. This bed plate an armature 11 and commutator 12, suitable brushes,of' course, being employed as illustratedin Figure 2. It is preferable to connect the field and armature in series, ,as shown in Figure 2, and it .is preferable to "lead the'terminals to binding posts 13 carried yby an insulating block 14, such'insulating' block being conveniently secured to a of the mechanism hereinafter described. The motor is provided with a driving shaft 16 and carries a worm 17, such worm being in Figure 1, and is closely ksurrounded by a cylindrical housing 21, as may be lmost clearlyv seen from yFigures 1 and 4. This housing 21 is provided withy ears 22 .whichy are apertured and which, together with the bed plate 1, receives dowel pins 23 to secure accurate positioning of such housing, suitable screws 24 being employed to secure the housing in its fixed relation to the bed plate. This drum 20 provides a fiy wheel effect for the motor in addition to the mass of the armature and thus prevents any temporary small variation in speed even when the stylus of thc reproducer is loaded excessively at certain portions of the record. However, a governor is provided for the motor and is preferably carried by the drum 20.

The governor mechanism comprises a plunger 25 which is provided with a friction face 26 of any suitable material which may either contact with or be held out of engagement with the inner peripheral portion of the casing 2l. This plunger is supported by means of a tightly wound helical spring 27 secured at its inner side to the plunger supporting member 28, such member also including a plate 29 provided with an aperture 30 equipped with inwardly converging or slanting walls and with a cylindrical portion, as may 'be clearly seen from Figures 4, 5 and 6. The plunger 25 and the plunger supporting portion are slidably carried within a diametrically arranged aperture 31 which passes through the drum 20. This aperture may be formed by boring a hole along a diameter and through the drum 20, as shown in Figures 1 to 6. If desired, a closing member 32 may be provided for one end of the aperture.

The casing is provided with an outwardly projecting apertured boss accurately seated within a central cut out portion 34 in the casing and held thereto in any suitable manner. This boss carries a controlling and adjusting plug 35 for the governor mechanism. This plug is provided with a conical -terminal 86 adapted to enter the aperture 30 and to thus adjust the position of the plunger 25 with reference to the innery peripheral portion Vof the casing 21. The plug is arranged in axial alignment with the motor driving shaft 16, as shown in Figure 5, and is preferably provided with a slot 37 adjacent its outer end. This slot receives the flange 38 of a screw 39 threaded into the boss 33, as shown in Figures 5 and 6. The screw is controlled by means of a flexible shaft 40 which passes to a manual adjusting thumb screw 41 (see Fig. l) such adjusting screw being carried within a disk 42 and located upon the exterior or Lipper side of the phonograph top 6. Tf desired, this adjusting thumb screw may be threaded to the disk 42, as shown, and consequently the distance between such screw and the controlling screw 39 may be maintained constant if the threads are of the same pitch.

By rotating the thumb screw 41, the adjusting screw 39 is rotated and the plug 35 is moved to the desired point thus providing a micrometer adjustment for the plunger 25 and thus controlling the speed of the apparat-us.

It is to be noted that the centrifugal force tends to d-raw the plunger out into engagement wit-h the inner portion of the casing 2l, and that the exact setting of the support 28 for the plunger may be controlled by the micrometer adjustment.

Tt is to be noted that the motor is a series motor and is adapted to run upon either alternating or direct current and may be connected with ordinary lighting supply mains.

Further, this series motor is not a constant speed motorl due to the well known characteristics of the series motor, and constantly cooperates with the utmost facility with the governing mechanism, the speed of the motor being accurately controlled by the mechanical governor.

Although the invention has been described in considerable detail, it is to be understood that the invention may be variously e-mbodied and is, therefore, to be limited only as claimed.

I claim:

l. In a phonograph, the combination of a motor having a driving shaft, a record rotating spindle operatively connected thereto, a guide carried bysaid driving shaft,

plunger slidably carried thereby and mount-` ed eccentrically relatively to said driving shaft, a plunger supporting member, a spring joining said plunger supporting member and said plunger, a cam member motilited coaxially with said shaft and cooperating with said plunger supporting member for controlling the position of said plunger, means for controlling said cam member, and a circular casing coaxial with said shaft, and enclosing said plunger, said plunger being adapted to frictionally slide along said casing under certain conditions of adjustment of said cam member.

2. In a phonograph, the combination of an electric motor having a driving shaft, a record yrotating spindle connected thereto by speed reduction mechanism, a drum carried by said driving shaft and having a diametrical passage thereacross, a circular casing surrounding said drum, a plunger slidably mounted in said passage and adapted to frictionally engage the interior periphery of said casing, a supporting member slidably carried by said drum, a spring connecting said supporting member and said plunger, a conical plug engaging said support-ing member and mounted in axial alignment with said driving shaft, and micrometer means for adjusting said plunger.

3. In a phonograph, the combination of a vseries electric motor having a driving shaft,

centric with reference to said drum, a supporting member for said plunger carried by said drum and having an aperture therein, a spring connecting saidsupporting member and said plunger, a conical plug mounted in axial alignment with said drivingshaft and adaptedto enter the aperture in said .In testimony that I claim the foregoing I 10 Vhave hereunto set my hand at Sheboygan Falls, in the countyy of Sheboygan and State of Wisconsin.

CARL SCHWARTZ. 

